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The synthesis and characterization of Mg 2 Ni compound by using mechanical alloying through wet method have been performed. The Mg 2 Ni sample was prepared by mixing the Mg and the Ni powders in the media of toluene under argon atmosphere. The mixtures are then milled under the varied milling time of 5, 10, 15, 20, and 25 hours in order to measure the growth of Mg 2 Ni compound. The X-ray diffraction measurement result showed that both Mg 2 Ni and MgNi 2 crystals could grow well. From the refinement results of the X-ray diffraction pattern using Rietan analysis indicated that the fraction of Mg 2 Ni and MgNi 2 compounds formed are 9.31% and 4.1%, 23.31% and 17.63%, 45.3% and 23.73%, 62.04% and 19.08%, 87.44% and 0.05% for the milling time of 5, 10, 15, 20, and 25 hours, respectively. This result differs from that obtained from the previous research, especially for 25 hours of milling time, the fraction of Mg 2 Ni and MgNi 2 compounds formed were only reach 51.03% and 8.86%, due to the growing of the pollutant phase like MgO. The use of toluene as the media of milling succeeded to remove the growth of the MgO compound.

New Synthesis Method of the Mg<sub>2</sub>Ni Compound by Using Mechanical Alloying for Hydrogen Storage